<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Main</title>

<script>
	function onbutton() {
		document.location.href = "index.html";
	}
</script>

<link href="style.css" rel="stylesheet" type="text/css">
</head>

<body bgcolor="black">
	<div id="Box">
    	<button class="button">버튼1</button>
    	<button class="button">버튼2</button>
        <br/>
    	<button class="button">버튼3</button>
    	<button class="button" onclick="onbutton()">버튼4</button>
    </div>
</body>
</html>
